Entangled photons from para-positronium decay: Do coincidences from scattered photons imply a Bell state?

• URL: http://arxiv.org/abs/2606.31726v1
• Date: Tue, 30 Jun 2026 14:26:51 GMT
• Title: Entangled photons from para-positronium decay: Do coincidences from scattered photons imply a Bell state?
• Abstract summary: We show how polarization-dependent Compton scattering can be used to verify that the two photons in the spin-zero case (para-positronium) are emitted in a maximally entangled Bell state.
• Score: 0.03683202928838613
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Electron and positron can form a meta-stable bound state called positronium that decays via pair annihilation. We show how polarization-dependent Compton scattering can be used to verify that the two annihilation photons in the spin-zero case (para-positronium) are emitted in a maximally entangled Bell state. Our theoretical approach based on two-photon density matrices connects concepts from relativistic quantum electrodynamics and quantum information theory.

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